chore(deps): update docker/build-push-action action to v2.8.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/build-push-action	action	minor	v2.7.0 -> v2.8.0

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Release Notes

docker/build-push-action

v2.8.0

Compare Source

• Allow specifying subdirectory with default git context (#​531)
• Add cgroup-parent, shm-size, ulimit inputs (#​501)
• Don't set outputs if empty or nil (#​470)
• docs: example to sanitize tags with metadata-action (#​476)
• docs: wrong syntax to sanitize repo slug (#​475)
• docs: test before pushing your image (#​455)
• readme: remove v1 section (#​500)
• ci: virtual env file system info (#​510)
• dev: update workflow (#​499)
• Bump @​actions/core from 1.5.0 to 1.6.0 (#​160)
• Bump ansi-regex from 5.0.0 to 5.0.1 (#​469)
• Bump tmpl from 1.0.4 to 1.0.5 (#​465)
• Bump csv-parse from 4.16.0 to 4.16.3 (#​451 #​459)

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